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Rules

No pirated content.[why?because.] This subreddit is for the discussion of torrenting culture and for learning how to use torrents. In other words, do not ask for links and do not post links to torrent files (/r/illegaltorrents) or sites (/r/trackers).

The receiving client would immediately notice that the incoming data does not pass the hash check and discard it. But this would not make OPs torrent client detect it, so he would continue to send bad data to other peers or even repeatedly to the same peer.

Yes... yes it will. Congratulations, you have found a new practical application of BitTorrent. You'll just have to force it to re-check periodically, unless you can set it to do so automatically. But checking is a linear process, so you'll have to set it to check every X number of minutes, rather than continuously.